Picture Errors; High-Light In White Or Black - NEC MultiSync LCD1920NX User And Service Manual

3. Picture errors

3.1 High-light in white or black

Is High-light in white or black?
NG
Use [AUTO CONTRAST] to adjust video
gain and black-level offset value.
NG
Is the RGB input maintained at 0.7Vp-p
in L20, L21, and L22?
OK
Is the RGB input maintained at 0.7Vp-p
at IC01 Pins 7, 15, and 22?
OK
Check the conditions at IC01Pins 29 and 30.
OK
OK
NG
NG
Failure point
Normal
Normal
Failure point
Adjust the input on the signal side to 0.7Vp-p again.
Then, use [AUTO CONTRAST] in this mode again.
NG
OK
Normal
Failure point
Check L23, L25, and L26, and also the signal source.
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